This document discusses the use of the phrase "have something done" to indicate when someone arranges for a service to be done by another party. It notes that "have" is used as the main verb, along with the past participle of the verb for the service, to indicate that someone paid to have the service performed rather than doing it themselves. Examples are provided showing the difference between saying "I cleaned my car" versus "I had my car cleaned." It also mentions that auxiliary verbs are used for questions and negatives with this construction, and that "by" can be used to indicate who performed the service.